From 78fb7ccd413ca655bdbe4adc9b4b256f20e11fe5 Mon Sep 17 00:00:00 2001
From: ROUVREAU Vincent <vincent.rouvreau@inria.fr>
Date: Sun, 24 May 2020 10:16:58 +0200
Subject: c++ version to trigger exact/inexact kernel

---
 src/python/include/Alpha_complex_interface.h | 73 ++++++++++++++++++++--------
 1 file changed, 54 insertions(+), 19 deletions(-)

(limited to 'src/python/include/Alpha_complex_interface.h')

diff --git a/src/python/include/Alpha_complex_interface.h b/src/python/include/Alpha_complex_interface.h
index 3dd01345..46f2ba03 100644
--- a/src/python/include/Alpha_complex_interface.h
+++ b/src/python/include/Alpha_complex_interface.h
@@ -29,40 +29,75 @@ namespace Gudhi {
 
 namespace alpha_complex {
 
-using Exact_kernel = CGAL::Epeck_d< CGAL::Dynamic_dimension_tag >;
-using Inexact_kernel = CGAL::Epick_d< CGAL::Dynamic_dimension_tag >;
-
-template <class Kernel>
 class Alpha_complex_interface {
-  using Point_d = typename Kernel::Point_d;
+ private:
+  using Exact_kernel = CGAL::Epeck_d< CGAL::Dynamic_dimension_tag >;
+  using Inexact_kernel = CGAL::Epick_d< CGAL::Dynamic_dimension_tag >;
+  using Point_exact_kernel = typename Exact_kernel::Point_d;
+  using Point_inexact_kernel = typename Inexact_kernel::Point_d;
+
+  template <typename CgalPointType>
+  std::vector<double> pt_cgal_to_cython(CgalPointType& ph) {
+    std::vector<double> vd;
+    for (auto coord = ph.cartesian_begin(); coord != ph.cartesian_end(); coord++)
+      vd.push_back(CGAL::to_double(*coord));
+    return vd;
+  }
+
+  template <typename CgalPointType>
+  CgalPointType pt_cython_to_cgal(std::vector<double> const& vec) {
+    return CgalPointType(vec.size(), vec.begin(), vec.end());
+  }
 
  public:
-  Alpha_complex_interface(const std::vector<std::vector<double>>& points) {
-    auto mkpt = [](std::vector<double> const& vec){
-      return Point_d(vec.size(), vec.begin(), vec.end());
-    };
-    alpha_complex_ = std::make_unique<Alpha_complex<Kernel>>(boost::adaptors::transform(points, mkpt));
+  Alpha_complex_interface(const std::vector<std::vector<double>>& points, bool fast_version)
+  : fast_version_(fast_version) {
+    auto pt = pt_cython_to_cgal<Point_inexact_kernel>(points[0]);
+    if (fast_version_) {
+      auto mkpt = [](std::vector<double> const& vec) {
+        return Point_inexact_kernel(vec.size(), vec.begin(), vec.end());
+      };
+      ac_inexact_ptr_ = std::make_unique<Alpha_complex<Inexact_kernel>>(boost::adaptors::transform(points, mkpt));
+      //ac_inexact_ptr_ = std::make_unique<Alpha_complex<Inexact_kernel>>(boost::adaptors::transform(points, pt_cython_to_cgal<Point_inexact_kernel>));
+    } else {
+      auto mkpt = [](std::vector<double> const& vec) {
+        return Point_exact_kernel(vec.size(), vec.begin(), vec.end());
+      };
+      ac_exact_ptr_ = std::make_unique<Alpha_complex<Exact_kernel>>(boost::adaptors::transform(points, mkpt));
+      //ac_exact_ptr_ = std::make_unique<Alpha_complex<Exact_kernel>>(boost::adaptors::transform(points, pt_cython_to_cgal<Point_exact_kernel>));
+    }
   }
 
-  Alpha_complex_interface(const std::string& off_file_name, bool from_file = true) {
-    alpha_complex_ = std::make_unique<Alpha_complex<Kernel>>(off_file_name);
+  Alpha_complex_interface(const std::string& off_file_name, bool fast_version, bool from_file = true)
+  : fast_version_(fast_version) {
+    if (fast_version_)
+      ac_inexact_ptr_ = std::make_unique<Alpha_complex<Inexact_kernel>>(off_file_name);
+    else
+      ac_exact_ptr_ = std::make_unique<Alpha_complex<Exact_kernel>>(off_file_name);
   }
 
   std::vector<double> get_point(int vh) {
-    std::vector<double> vd;
-    Point_d const& ph = alpha_complex_->get_point(vh);
-    for (auto coord = ph.cartesian_begin(); coord != ph.cartesian_end(); coord++)
-      vd.push_back(CGAL::to_double(*coord));
-    return vd;
+    if (fast_version_) {
+      Point_inexact_kernel const& ph = ac_inexact_ptr_->get_point(vh);
+      return pt_cgal_to_cython(ph);
+    } else {
+      Point_exact_kernel const& ph = ac_exact_ptr_->get_point(vh);
+      return pt_cgal_to_cython(ph);
+    }
   }
 
   void create_simplex_tree(Simplex_tree_interface<>* simplex_tree, double max_alpha_square,
                            bool exact_version, bool default_filtration_value) {
-    alpha_complex_->create_complex(*simplex_tree, max_alpha_square, exact_version, default_filtration_value);
+    if (fast_version_)
+      ac_inexact_ptr_->create_complex(*simplex_tree, max_alpha_square, exact_version, default_filtration_value);
+    else
+      ac_exact_ptr_->create_complex(*simplex_tree, max_alpha_square, exact_version, default_filtration_value);
   }
 
  private:
-  std::unique_ptr<Alpha_complex<Kernel>> alpha_complex_;
+  bool fast_version_;
+  std::unique_ptr<Alpha_complex<Exact_kernel>> ac_exact_ptr_;
+  std::unique_ptr<Alpha_complex<Inexact_kernel>> ac_inexact_ptr_;
 };
 
 }  // namespace alpha_complex
-- 
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